Eolian

The major desert areas of the world all lie between __ and __ degrees north or south of the equator.

10 and 30

What are the two ways wind erosion ways in?

deflation and abrasion

Define deflation.

the lifting and removal of loose sand and dust particles from Earth's surface

Define abrasion.

the sandblasting action of wind-blown sand

Deflation commonly occurs in semiarid regions where the protective cover of grass and shrubs has been removed by the activity of humans and animals. The results are board shallow depressions called what?

deflation basins

Wind can move only move sand and dust-sized particles, so the deflation leaves concentrations of coarser material known as?

lag deposits or desert pavements

What two landforms do abrasion leave behind?

ventifacts and yardangs

Wind transports sand by ____ and ____.

saltation and surface creep

Dust storms form thanks to what type of cloud?

cumulonimbus cloud

Explain have a sand dune migrates.

A sand dune migrates as sand grains move up the slope of the dune and accumulate in a protected area on the downwind face. The dune slowly moves grain by grain. As the grains accumulate on the downwind slope, they produce a series of layers (cross-beds) inclined in a downward direction.

Name the five types of dunes.

transverse, barchan, longitudinal, star, and parabolic dunes

Which type of dune usually covers sand seas?

transverse dunes

Barchan dunes form where the supply of sand is _____ and winds of moderate velocity blow in _____ direction.

limited; constant

What type of dune forms with three or more wind directions?

star dunes

What type of dune are formed with a limited sand supply and two wind directions?